- A/C = Aircraft.
- AC = Advisory Circular.
- ADL = Allowable Damage Limits.
- AOA = Angles of Attack.
- AOG = Aircraft On Ground.
- BL = Butt Line. The origin of the butt line (BL=0 or y=0) is located at the aircraft plane of symmetry.
- BVID = Barely Visible Impact Damage.
- CC = Cooling Climb.
- CDT = Critical Damage Thresholds.
- CFRP = Carbon Fiber Reinforced Polymer.
- CDR = Critical Design Review.
- CP = Center of Pressure.
- CRL = Concept Readiness Level. Early validation of feasibility and mission fit.
- DoD = Department of Defense.
- EASA = European Aviation Safety Agency.
- EDTO = Extended Diversion Time Operations.
- ELAC = Elevator and Aileron Computers: ELAC1, ELAC2.
- EOP = End of Pipe.
- ETOPS = Extended-range Twin-engine Operational Performance Standards.
- FAA = Federal Aviation Administration.
- FAC = Flight Augmentation Computer: FAC1, FAC2.
- FBO = Fan Blade Out.
- FDEO = Flight Development Engineering Order. Formal, controlled document used in the aerospace industry during the flight test and development phase of an aircraft. It provides specific instructions for modifications, installations, or test procedures that are not yet covered by approved maintenance or operations manuals.
- FS = Fuselage station. The origin of the fuselage station (FS=0 or x=0) is placed at the nose tip or approximately 50 to 100 inches ahead of the nose.
- HGW = High-Gross Weight.
- IATA = International Air Transport Association.
- IWT = Ice Wind Tunnel.
- ICAO = The International Civil Aviation Organization.
- ISA = International Standard Atmosphere.
- LROPS = Long Range Operations.
- MRL = Manufacturing Readiness Level. (Level 1: Basic Manufacturing Implications; Level 2: Manufacturing Concepts; Level 3: Proof of Concept; Level 4: Lab Production; Level 5: Prototype Components; Level 6: Prototype System at Production Relevant Environment; Level 7: Produce Systems and Subsystems in a Production Environment; Level 8: Pilot Line; Level 9: Low-Rate Initial Production; Level 10: Full-Rate Production).
- MRO = Maintenance, Repair, and Operations.
- MTOW = Maximum Takeoff Weight.
- NOAA = National Oceanic and Atmospheric Administration.
- NOE = Notice of Escapement. Example: The supplier informed Boeing that a nonconforming product may have been shipped.
- OAT = Outside Air Temperature.
- PDR = Preliminary Design Review.
- PRL = Production Readiness Level. Readiness for sustained production (often used in industry).
- RDL = Repairable Damage Limits.
- RFI = Request for Information.
- RR = Rolls-Royce.
- SAT = Static Air Temperature.
- SDP = Standard Datum Plane.
- SEC = Spoiler and Elevator Computers: SEC1, SEC2, SEC3.
- SFCC = Slat Flap Control Computer
- SNN = Supplier Nonconformance Notification.
- SRM = Safety Risk Management.
- SRL = System Readiness Level. Overall system maturity (combines TRL + IRL).
- STA = Station.
- TDP = Technology Development Plan.
- TDP = Technology Demonstration Program.
- THS = Trimmable Horizontal Stabilizer.
- TRB = Technical Review Board.
- TRL = Technology Readiness Level.
- TRM = Technical Review Meeting.
- URL = Ultra Long Range.
- VARTM = Vacuum-Assisted Resin Transfer Molding.
- VID = Visible Impact Damage.
- WL = Water Line. The origin of the water line (WL=0 or z=0) is placed at the nose tip, at the ground, or approximately 100 to 200 inches below the nose tip.
- WS = Wing Station.
- XWB = eXtra Wide Body.
Last Updated on 2026-01-07 by gantovnik
Recent Comments